|Elevation||915 ft (279 m)|
|Area||0.48 sq mi (1 km2)|
|- land||0.48 sq mi (1 km2)|
|- water||0.00 sq mi (0 km2)|
|Density||1,783.4 / sq mi (689 / km2)|
|Village President||Bonnie Foust|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: Shannon, Illinois|
As of the census of 2000, there were 854 people, 337 households, and 232 families residing in the village. The population density was 1,783.4 people per square mile (686.9/km²). There were 357 housing units at an average density of 745.5 per square mile (287.2/km²). The racial makeup of the village was 96.84% White, 0.35% African American, 0.23% Native American, 1.29% Asian, 0.12% from other races, and 1.17% from two or more races. The ethnic makeup was 0.82% partially Hispanic or Latino.
There were 337 households out of which 29.4% had children under the age of 18 living with them, 61.1% were married couples living together, 5.6% had a female householder with no husband present, and 30.9% were non-families. 27.6% of all households were made up of individuals and 14.2% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.99.
In the village the population was spread out with 24.8% under the age of 18, 4.8% from 18 to 24, 23.9% from 25 to 44, 24.0% from 45 to 64, and 22.5% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 90.2 males. For every 100 females age 18 and over, there were 87.7 males.
The median income for a household in the village was $42,500, and the median income for a family was $48,083. Males had a median income of $32,292 versus $21,667 for females. The per capita income for the village was $21,108. About 3.5% of families and 7.4% of the population were below the poverty line, including 5.1% of those under age 18 and 10.9% of those age 65 or over.
Shannon is home to three churches, Shannon Baptist, St. Wendelin's Catholic and Bethel United Methodist.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.